"User content migrated" Error when Creating OneDrive Webhook Subscription

Dear Microsoft Community,

Our application is encountering an undocumented error when attempting to set up a Webhook Subscription to a OneDrive app-root folder (/drive/special/approot). This issue began approximately one day after deployment, following an initial period where the subscription process worked correctly, and has now persisted for several weeks.

Here's the full error message:

{
  "error": {
    "code": "ExtensionError",
    "message": "Operation: Create; Exception: [Status Code: ServiceUnavailable; Reason: User content migrated. Cannot access disabled item.]",
    "innerError": {
      "date": "2025-06-10T10:58:15",
      "request-id": "edff6dc0-45b7-4e7c-8797-3134ebc6bae4",
      "client-request-id": "edff6dc0-45b7-4e7c-8797-3134ebc6bae4"
    }
  }
}

Could this error be related to:

- The absence of an MPN ID?

- The type of Microsoft account used for app registration (personal vs. work account)?

Any insights or suggestions would be greatly appreciated!